WO1997039263A1 - Ring-shaped sealing element - Google Patents
Ring-shaped sealing element Download PDFInfo
- Publication number
- WO1997039263A1 WO1997039263A1 PCT/EP1997/001927 EP9701927W WO9739263A1 WO 1997039263 A1 WO1997039263 A1 WO 1997039263A1 EP 9701927 W EP9701927 W EP 9701927W WO 9739263 A1 WO9739263 A1 WO 9739263A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing element
- projection
- annular sealing
- shaped
- element according
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/236—Piston sealing arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
- F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
Definitions
- the invention relates to an annular sealing element according to the preamble of claim 1.
- Sealing elements with a rigid support component and an elastomer part arranged thereon are known in principle.
- the opening and closing time of a valve is not exactly defined, since the part of the valve which causes the valve to open and close due to its displacement depends on it acting fluid pressure more or less far into the elastomer material of the sealing element, whereby the opening and closing time of the valve varies. This is undesirable in many applications, since the valve should have a constant, precisely defined opening and closing behavior.
- a sealing element according to the preamble of claim 1 is known from US Pat. No. 3,282,594.
- a similar sealing element is known from GB 2 256 687 A. Both sealing elements have in common that the elastomer component of the sealing element is integrally molded with the rigid support body. This is to ensure a good seal between the elastomer material and the material of the rigid support body.
- the invention is based on the object of providing an annular sealing element which is suitable for interacting with a displaceable valve body of a valve and in particular for ensuring that the opening and closing behavior of the valve is as constant as possible.
- the sealing element should also be inexpensive to manufacture without the
- the thin elastomer layer thus created which rests on the front free end of the projection, ensures that a movable valve body always lies softly and slightly dampened on the end face of the sealing element facing it and then, after a negligible compression phase, practically without delay on the Can support part formed of rigid material projection. Due to the support achieved in this way, a defined opening of the valve is ensured regardless of the pressure against which the valve must be opened.
- the described design of the sealing element according to the invention leads to a quasi-rigid stop for the displaceable valve body, without the sealing function of the sealing element therefore suffering.
- the complete overlap of the projection formed on the rigid part of the sealing element by the elastomer part ensures excellent tightness even under critical conditions. Since the greatest radial extension of the circumferential projection is only approximately at most 70% of the sum of the wall thicknesses S ⁇ and S a and the wall thicknesses Si and S a are approximately the same, sufficient elastomer material remains radially inside and radially outside the projection for a good, also radially elastic seal.
- the radial extent of the circumferential projection is preferably only at most about 50% of the sum of the wall thicknesses S 1 + S a .
- the annular circumferential projection of the part made of rigid material can, for example, have the shape of a closed circular ring.
- the annular circumferential projection can be formed by a plurality of circular ring segments, between which space is left for connecting webs.
- at least the free end of the annular circumferential projection can be formed by a series of pin-shaped extensions which are preferably evenly spaced apart from one another in the circumferential direction and which extend axially.
- the quasi-rigid stop is formed by an annular arrangement of approximately punctiform contact surfaces.
- the elastomer part has on its free end face several, preferably dome-shaped elevations spaced apart from one another in the circumferential direction.
- the radial extension of the projection towards its free end is preferably reduced.
- the radial extent of the projection can be reduced continuously or in steps.
- the part made of rigid material of the sealing element preferably has a hollow cylindrical extension on its end face facing away from the part made of elastomer material. This extension serves to better guide the displaceable piston.
- its part made of rigid material should in particular not have any passage recesses in the area with which it rests on the part made of elastomer material.
- the annular sealing element according to the invention is particularly suitable for use in a master cylinder of a hydraulic vehicle brake system.
- a master cylinder which is often also called a master brake cylinder, has a housing with a bore extending along a longitudinal axis, one end of which extends from a bore belonging to the housing of the master cylinder
- An axially displaceable piston which is arranged concentrically to the bore and has a central valve which has a fluid connection between one, is sealingly guided through the sealing element
- a master cylinder in which the annular sealing element is formed from two separate, annular and axially adjoining parts, the first of which faces the bore Part of an elastomeric material and the second part facing away from the bore consists of a rigid material is known from EP 0 467 021 AI.
- Master cylinders of this type are used in vehicles primarily together with brake pressure control systems, these brake pressure control systems nowadays frequently having both the function of preventing the vehicle wheels from locking when braking (so-called anti-lock braking system) and the function of spinning the drive wheels to prevent when accelerating, especially on slippery surfaces (so-called anti-slip regulation).
- the central valve arranged in the piston is in the unactuated state of the master cylinder, i.e. when the piston is in its rest or starting position, it is kept open by a contact component connected to the central valve, which is supported directly or indirectly on the end face of the part of the closure element made of elastomer material belonging to the closure element.
- the central valve is opened in that the system component connected to it comes into contact with the end face of the closure element facing the system component and is supported there during the return movement of the piston after its actuation of the master cylinder, which leads to the opening of the central valve.
- the fluid pressure built up in the pressure chamber of the main cylinder as part of the anti-slip control has there is no longer any opportunity for the brake actuators to relax, since the additional fluid volume which was supplied to the pressure chamber during the anti-slip control cycle to build up pressure cannot be returned to the fluid storage container due to the brake actuation which immediately follows in time.
- the opening time of the central valve varies since the system component connected to the central valve penetrates deeper into the elastomer part of the closure element, the higher the pressure then prevailing in the pressure chamber and the central valve can only open when there is a corresponding counterforce exerted by the closure element on the system component.
- a clear definition of the opening time of the central valve in relation to the piston arranged in the bore of the master cylinder is therefore not possible, instead the central valve opens earlier and later depending on certain operating conditions. This is undesirable for reasons of constant brake response behavior.
- Fig. 1 shows a longitudinal section through the end portion of a
- Fig. 2 shows a cross section through that used in Fig. 1
- FIG. 3 shows a view corresponding to FIG. 2 of a sealing element modified compared to FIGS. 1 and 2.
- Fig. 1 the force input end of a generally designated 10 master cylinder for a hydraulic vehicle brake system shown.
- the master cylinder 10 has an elongated housing 12 with a bore 14 running along a longitudinal axis A and in the embodiment shown stepped.
- the end (not shown here) of this bore 14 is usually from one to the housing 12 of the master cylinder 10 belonging front wall tightly closed.
- the other end of the bore 14 opposite this end is sealed as shown with a closure or sealing element 16, the structure of which will be explained in more detail later.
- a piston 18 which can be actuated through the latter is received in a sealing and axially displaceable manner.
- a central valve 20 In the piston 18 there is a central valve 20 with a valve seat 22 and a spring in
- the central valve 20 releases a fluid connection between a fluid reservoir (not shown), which is connected to the follow-up bore 26, and a pressure chamber 28, which is not in the bore 14 between the piston 18 and the one shown, closed one end of the bore 14 is limited.
- the piston 18 is shown in the figure in its rest or initial position, which it assumes in the unactuated state and in which it is biased in the usual way by a return spring 30.
- the parts of the master cylinder 10, not shown are of conventional, known design and are therefore not explained in detail.
- a similarly constructed second piston can be found in the part of the master cylinder 10 which is not shown and which is then referred to as the secondary piston.
- the valve body 24 of the central valve 20 has a pin-shaped extension 32 which extends through the piston 18 and at the free end of which extends as a stop component
- Cross pin 34 is attached.
- the cross pin 34 is in one piece with the play in a radial through recess 36
- the transverse pin 34 bears against a stop ring disk 40, which in turn is in contact with the end face of an elastomer part 42 belonging to the sealing element 16, so that the central valve 20 is held in the open position.
- the sealing element 16 has an axially adjoining, separate and also annular part 44 made of rigid material, for example of a suitable, hard plastic.
- the part 44 made of rigid material On its end face facing the elastomer part 42, the part 44 made of rigid material has an annular circumferential, axially extending projection 46 which is completely covered by the elastomer part 42 and which in the example shown tapers conically towards its free end, whereby its free end, in accordance with the first embodiment shown in FIGS. 1 and 2, is formed by a series of pin-shaped extensions 48 which are evenly spaced apart from one another in the circumferential direction and which likewise extend axially. As can be seen better from FIG. 2, the
- Axial extent of the projection 46 (including its extensions 48) is selected such that the elastomer part 42 is almost completely penetrated axially by the projection 46.
- axial extent of the projection 46 is selected such that the elastomer part 42 is almost completely penetrated axially by the projection 46.
- D Between the end face of the elastomer part 42 in contact with the stop ring disk 40 and the end face surface of each of the pin-shaped extensions 48 there is only a thin elastomer layer of thickness D (see FIG. 2).
- the radial inner section of the elastomer part 42 adjoining the projection 46 has a radial wall thickness S and the radially outer section of the elastomer part 42 adjoining the projection 46 has a radial wall thickness S a , where S 1; and S ⁇ _ have approximately the same value.
- the biggest Ra dialer extension S of the projection 46 which in the exemplary embodiment shown is due to the conical configuration of the projection 46 at its base, is approximately 50% of the sum of the wall thicknesses S and S here.
- a series of dome-shaped elevations 49 are formed in one piece with the elastomer part 42 on the free end face of the elastomer part 42. Each dome-shaped elevation 49 is arranged exactly above one of the pin-shaped extensions 48 of the projection 46.
- the parts 42 and 44 of the sealing element 16, which are inexpensive to produce due to the separate design, are detachably connected to one another by joining them together.
- the sealing element 16, the part 44 of which, in the example shown, has an integrally molded, hollow-cylindrical extension 50 for better guidance of the actuating extension 38, is held in the step-widened end section of the bore 14 of the master cylinder 10 by a snap ring 52 arranged in a circumferential groove.
- the function of the master cylinder 10 shown is as follows: starting from the initial position shown of all parts, when the brake system is actuated by the driver, the piston is moved via the rod-shaped input member, not shown, which is connected to the actuation extension 38 of the piston 18 18 relative to the housing 12 of the master cylinder 10 shifted to the left in relation to the figure.
- the cross pin 34 which keeps the central valve 20 open in the unactuated state of the master cylinder, is released from the stop ring disk 40 and the central valve 20, which is spring-biased in the closing direction, closes, after which, according to the further axial displacement of the piston 18, fluid pressure in the pressure chamber 28 is built.
- the sealing element 16 takes over both the sealing of the bore 14 with respect to the actuation extension 38 and its guidance.
- the relaxation movement when the brake is released takes place accordingly in the reverse order, ie the piston 18 moves under the action of the return spring 30 to the right in relation to the figure and the cross pin 34 comes into contact with the stop shortly before the piston 18 reaches the rest position ⁇ washer 40, so that the central valve 20 opens again and a possibly existing, low residual pressure in the pressure chamber 28 is discharged via the trailing bore 26 into the fluid reservoir, not shown.
- an anti-slip control cycle expired shortly before a brake actuation by the driver, within the scope of which an additional fluid volume was automatically supplied from the fluid reservoir to the pressure chamber 28 in order to provide brake pressure to reduce the wheel slip . If a brake application is initiated by the driver immediately following such an anti-slip control cycle, the central valve 20 must be opened at the end of the braking against a partially considerable overpressure, since a pressure release in the pressure chamber 28 by a feedback of the supplied during the anti-slip control cycle , additional fluid volume in the fluid reservoir was no longer possible before the directly subsequent brake application initiated by the driver.
- the rigid material of the Part 44 does not permit any further axial displacement of the stop ring disk 40 and thus also of the transverse pin 34, so that the central valve 20 opens reliably against a high overpressure and while maintaining a precisely defined opening point with respect to the position of the piston 18.
- the sealing element 16 'shown in FIG. 3 differs from the sealing element 16 used in the previously described first embodiment only in that instead of the pin-shaped extensions 48 there is a single, ring-shaped closed extension 54, one opposite the one below arranged part of the projection 46 has a smaller cross-sectional dimension.
- the dome-shaped elevations 49 are arranged on the end face of the elastomer part 42 above the extension 54 and are evenly spaced apart from one another in the circumferential direction.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
- Sealing Devices (AREA)
- Check Valves (AREA)
- Lift Valve (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97921653A EP0894213B1 (en) | 1996-04-17 | 1997-04-17 | Ring-shaped sealing element |
JP53675797A JP4104169B2 (en) | 1996-04-17 | 1997-04-17 | Annular seal |
DE59704536T DE59704536D1 (en) | 1996-04-17 | 1997-04-17 | RING-SHAPED SEALING ELEMENT |
US09/138,208 US6203022B1 (en) | 1996-04-17 | 1998-08-21 | Annular sealing element |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19615157A DE19615157A1 (en) | 1996-04-17 | 1996-04-17 | Annular sealing element |
DE19615157.0 | 1996-04-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997039263A1 true WO1997039263A1 (en) | 1997-10-23 |
Family
ID=7791530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/001927 WO1997039263A1 (en) | 1996-04-17 | 1997-04-17 | Ring-shaped sealing element |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0894213B1 (en) |
JP (1) | JP4104169B2 (en) |
KR (1) | KR100433840B1 (en) |
DE (2) | DE19615157A1 (en) |
ES (1) | ES2163150T3 (en) |
WO (1) | WO1997039263A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI421419B (en) * | 2011-08-05 | 2014-01-01 | Ashima Ltd | Piston ring structure in hydraulic brake |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19749235C2 (en) * | 1997-11-07 | 2001-02-22 | Ro Ra Vertriebs Ges M B H | Sealing arrangement |
US6196552B1 (en) * | 1998-06-08 | 2001-03-06 | Automotive Products (Usa), Inc. | Seal assembly for annular hydraulic cylinder |
DE29810274U1 (en) | 1998-06-09 | 1998-09-17 | Festo AG & Co, 73734 Esslingen | Scraper |
DE19839597A1 (en) * | 1998-08-31 | 2000-03-02 | Continental Teves Ag & Co Ohg | Sealing insert, in particular for a piston of a hydraulic vehicle brake system |
DE10046976A1 (en) * | 2000-09-22 | 2002-04-18 | Knorr Bremse Systeme | Pressure limiter for pneumatic valves |
FR2881202B1 (en) * | 2005-01-25 | 2007-04-27 | Freudenberg Soc Par Actions Si | RIGID FRAME SEAL PIECE |
DE102006012057A1 (en) | 2006-03-08 | 2007-09-13 | Dittmann, Ludwig, Dipl.-Ing. | Bearing system for a two-piece steering shaft |
DE102006040487B3 (en) | 2006-08-30 | 2007-11-08 | Lucas Automotive Gmbh | Sealing ring for piston in brake cylinder fits into annular groove in cylinder wall and has sealing lip on its back of the ring which fits against piston, spacer nearer outside edge of ring projecting beyond it |
DE102011078638A1 (en) * | 2011-07-05 | 2013-01-10 | Siemens Aktiengesellschaft | Command and message device |
DE102014110077B4 (en) * | 2014-07-17 | 2016-02-18 | Dionex Softron Gmbh | Sealing system and method for its assembly |
DE102015205938A1 (en) | 2015-04-01 | 2016-10-06 | Continental Teves Ag & Co. Ohg | Brake device with a working fluid container |
DE102017218768A1 (en) * | 2017-10-20 | 2019-04-25 | Continental Teves Ag & Co. Ohg | Brake device for a hydraulic motor vehicle brake system with a stop disc |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3282594A (en) * | 1964-07-09 | 1966-11-01 | John H Wheeler | Swivel seal |
US4281590A (en) * | 1979-01-02 | 1981-08-04 | Weaver Joe T | Piston construction for reciprocating pumps |
EP0519533A1 (en) * | 1991-06-15 | 1992-12-23 | Delphi France Automotive Systems | Master cylinder and end fitting therefor |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US876977A (en) * | 1907-06-20 | 1908-01-21 | Fred A Jones | Plunger-packing. |
SE375591B (en) * | 1973-08-28 | 1975-04-21 | Skega Ab | |
GB9112949D0 (en) * | 1991-06-15 | 1991-08-07 | Gen Motors France | Master cylinder and end fitting therefor |
DE4225556C2 (en) * | 1992-08-03 | 1995-05-04 | Freudenberg Carl Fa | Rod guide supported between radially inward projections of a cylinder surface |
DE19505115A1 (en) * | 1995-02-13 | 1996-08-14 | Teves Gmbh Alfred | Seal-packet for master-cylinder of hydraulic brake system |
-
1996
- 1996-04-17 DE DE19615157A patent/DE19615157A1/en not_active Withdrawn
-
1997
- 1997-04-17 WO PCT/EP1997/001927 patent/WO1997039263A1/en active IP Right Grant
- 1997-04-17 JP JP53675797A patent/JP4104169B2/en not_active Expired - Lifetime
- 1997-04-17 EP EP97921653A patent/EP0894213B1/en not_active Expired - Lifetime
- 1997-04-17 ES ES97921653T patent/ES2163150T3/en not_active Expired - Lifetime
- 1997-04-17 DE DE59704536T patent/DE59704536D1/en not_active Expired - Lifetime
- 1997-04-17 KR KR10-1998-0707305A patent/KR100433840B1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3282594A (en) * | 1964-07-09 | 1966-11-01 | John H Wheeler | Swivel seal |
US4281590A (en) * | 1979-01-02 | 1981-08-04 | Weaver Joe T | Piston construction for reciprocating pumps |
EP0519533A1 (en) * | 1991-06-15 | 1992-12-23 | Delphi France Automotive Systems | Master cylinder and end fitting therefor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI421419B (en) * | 2011-08-05 | 2014-01-01 | Ashima Ltd | Piston ring structure in hydraulic brake |
Also Published As
Publication number | Publication date |
---|---|
JP2000508414A (en) | 2000-07-04 |
JP4104169B2 (en) | 2008-06-18 |
EP0894213A1 (en) | 1999-02-03 |
DE59704536D1 (en) | 2001-10-11 |
ES2163150T3 (en) | 2002-01-16 |
EP0894213B1 (en) | 2001-09-05 |
KR19990087806A (en) | 1999-12-27 |
KR100433840B1 (en) | 2004-07-16 |
DE19615157A1 (en) | 1997-10-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69424914T2 (en) | INSULATION SYSTEM OF A SPRING CHAMBER FOR A PRESSURE OPERATED BRAKE CONTROL DEVICE | |
DE2602050C3 (en) | Hydraulic booster valve, in particular for a hydraulic brake system of a motor vehicle | |
EP0894213B1 (en) | Ring-shaped sealing element | |
EP0504357B1 (en) | Brake master cylinder for an anti-lock hydraulic braking system | |
EP0607370B1 (en) | Piston with central valve for hydraulic braking systems | |
DE2926499A1 (en) | BRAKE PRESSURE CONTROL UNIT FOR VEHICLE BRAKE SYSTEMS | |
EP0348648B1 (en) | Brake appliance | |
DE19610834C1 (en) | Master cylinder for hydraulic brake system of motor vehicle | |
EP1022468A2 (en) | Piston pump | |
EP1753985B1 (en) | Hydraulic linear drive, especially hydraulic transmission actuator | |
WO2013152895A1 (en) | Master brake cylinder arrangement for a motor vehicle brake system, and integral sealing throttle element for the same | |
EP1244116B1 (en) | Method of manufacturing an armature | |
EP0691251B1 (en) | Master brake cylinder with fast-fill chamber | |
DE10258790B4 (en) | Piston for a hydraulic brake system and thus equipped master cylinder | |
DE102006033534A1 (en) | Pneumatic braking force booster used in e.g. automobile industry, has device for adjusting output active surface of output member | |
DE19653270B4 (en) | Master cylinder for hydraulic actuation systems | |
DE10108775B4 (en) | master cylinder | |
DE4447544C2 (en) | Servo valve arrangement | |
DE19641889C1 (en) | Brake booster with electromagnetic actuation unit | |
DE69511898T2 (en) | PNEUMATIC BRAKE-AMPLIFIER WITH ELASTIC VALVE | |
DE3424004C2 (en) | ||
EP2185391B1 (en) | Vacuum brake booster for a motor-vehicle brake system | |
DE10034787A1 (en) | Two stage valve | |
DE102011114708A1 (en) | Master brake cylinder with improved pressure reduction behavior | |
WO1990012714A2 (en) | Master cylinder for a hydraulic brake and steering brake system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): JP KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1997921653 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1019980707305 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 1997921653 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1019980707305 Country of ref document: KR |
|
WWG | Wipo information: grant in national office |
Ref document number: 1997921653 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1019980707305 Country of ref document: KR |